mlen
Put double quotes for each string in a list of strings
Hi, y’ all!
I want to wrap each string from the list of strings in double quotes - so given a string:
my_string = "bilbao, newcastle-upon-tyne, gothenburg, munich "
I expect a nicely formatted one:
my_string = "bilbao", "newcastle-upon-tyne", "gothenburg", "munich"
For now I only came up with some lame solution (due to fever?!..)
iex> my_string = "bilbao, newcastle-upon-tyne, gothenburg, munich "
iex> IO.puts
my_string
|> String.split(",")
|> Enum.map(&String.trim/1)
|> Enum.map(&String.replace_prefix(&1, "", ~s(")))
|> Enum.map(&String.replace_suffix(&1, "", ~s(")))
|> Enum.join(", ")
"bilbao", "newcastle-upon-tyne", "gothenburg", "munich"
Requirements:
- performance is not really important here,
- output strings are same order as input strings,
- strings are utf8,
- prefer to avoid regex.
Thanks!
Marked As Solved
t0t0
Hi,
I was wondering if Kernel.inspect/1 would feet? (mostly in case a " needs to be escaped according to Elixir syntax)
"bilbao, newcastle-upon-tyne, gothenburg, munich "
|> String.split(",")
|> Stream.map(&String.trim/1)
|> Stream.map(&inspect/1)
|> Enum.join(", ")
|> IO.puts()
Also, it is possible to regroup the Enum.map + Enum.join operations in the previous answer with Enum.map_join/3 
Also Liked
cjbottaro
I’d just use string interpolation.
String.split(my_string, ",")
|> Enum.map(fn s ->
s = String.trim(s)
"\"#{s}\""
end)
|> Enum.join(", ")
Or string concatenation if you prefer.
String.split(my_string, ",")
|> Enum.map(fn s ->
"\"" <> String.trim(s) <> "\""
end)
|> Enum.join(", ")
Your solution is calling map many times, each doing a single step. A single call to map can do all the steps necessary, regardless of string interpolation, concatenation, or replace.
hst337
NIT: Enum.map_join
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